Short summary: It's a guy. Whenever he dies, he goes [to hell. the Foundation doesn't know.] The important part later is that some time later he comes back in an out-of-the-way place, and lets loose some [essentially demons.] So, ideally, he'd be kept alive. He's aging normally throughout, so when he dies of age, he's dead for real.

Except he is a guy what fights good cuz he is super strong, which is how he survives what he goes through, and he's not happy about being kept locked up either.

What I want to make a point is how essentially if he was kept out of containment, he'd likely not die and thus not let more [demons] loose, and the Foundation is containing him because he's still a super strong guy and that's anomalous and has to be contained on principle. And then he has to be kept in a precarious balance where he isn't killed, because then he's essentially escaped, but when he's not dead he's vying to escape because he doesn't have anything better to do either.

I don't know if that's much of a hook, though, and if it can save the idea from iffiness.

The way I prefer to think about this is less "power with a drawback" and more "drawback with a power". 116 has no joints, so he'd be normally immobile - but he can move, breaking his bones, and heals fast enough for that not to kill him. And this guy goes to [hell] whenever he dies, that being also quite horrible - but he's strong enough to get out.

In fact, maybe that's how it came to be. You might wonder - what happens if he dies in [hell]? The original idea was that he dies for real, too. But maybe that'd be too merciful. Maybe he doesn't die, just reappears again, still in [hell]. And maybe at first he wasn't any stronger than an average person. So he died of [demons], and died, and died, again and again, in horrible pain every time. But dying in myriad horrible ways has left him stronger with each death, so that eventually he could hold his own against [demons] and eventually escape to return to Earth at last.

Only to find some big huge global organization trying to hold him as well.

And the article wouldn't be his story, the story of what he went through. It'd be the story of that anomalous humanoid object that's completely uncooperative and lets [demons] loose whenever he dies, what a nuisance. The other story would still be there, though, in hints and spoilers.

Well, I think the concept of a guy that gets spit out by hell whenever he dies is interesting enough if there's more to it than that. Why doesn't hell want him? And shit yes, what if hell leaks into this world every time he does? But the rest of it, the powers etc. … I'd lose that in an instant.

The big problem you're facing if you want to do literal hell is that you'll need to make it credible on a theological level. There's a lot of misconceptions out in the wild, and if you latch onto the basic version we all know, this isn't going to end well.

However, what if he's a reality bender who's simply convinced himself he's evil enough to go to hell, but also thinks he can't really die. As a result, he dies, creates a temporary hell and gets spit out again. What leaks back into this world are his own creations. It presents an interesting problem, because what happens is real, absolutely real, and to keep him from dying he'll need to be protected. On the other hand, convincing him he can die solves the problem of hell leaking into this world, but it also effectively neutralizes him.

Although that could also make it a cool Neutralized article, where we manage to do just that. Of course, that would also hinge on him not understanding what reality bending is exactly.